The Green Party Leader has set a target of winning six Dáil seats in the next general election.
Speaking on RTÉ's The Week in Politics, Eamon Ryan said this number would allow his party take up a role in Government to deliver change in the area of environmental policy.
Mr Ryan added that his party's priorities off the back of its recent electoral success were tackling climate change and protecting the environment.
Mr Ryan said he wants to develop a land use plan to address how resources are used, and reform the transport system, which he called completely unsustainable in its current state.
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Sinn Féin TD Eoin Ó Broin said his party is going to have to change how it communicates and that one of the messages it received on the doors was that it comes across as too negative.
His party went into the elections hoping to grow its number of seats but lost seats instead, as the party's traditional base did not turn out on the day, Mr Ó Broin added.
He said it was the party's fault and not voters, and the party must look at itself because of it.
Mr Ó Broin said if you look at the election, half of the voters did not turn out, and many of those will be hit by issues that Sinn Féin wants to look at.
Sinn Féin needs a very quick and honest review following its election performance, and the target for the party is to now reverse the setbacks it has suffered, he added.
He argued that having a recount in the European election for the Ireland South constituency was justifiable as in a vote you have to be absolutely certain of the result.
He said there is anger out there with people who feel left behind by the Government - who instead of voting for other parties - have become disillusioned with the political process altogether.
He said it was crucial that an electoral commission was established.
Fianna Fáil's spokesperson on Brexit Stephen Donnelly said his party needs to address its poor performance among younger voters.
He said there is a lot that the party is doing that matters to young people, but they need to do a better job of communicating it.
On the prospect of a general election - he said it was above his pay grade and was a matter for the Taoiseach.
He said his party's stance has been consistent in that it facilitates a Government to address the issue of Brexit and added that the country is still facing an existential threat in the form of Brexit.
He said his party would "work with the Government" while this threat remains in what he described as "constructive politics".
Fine Gael MEP Mairead McGuiness would make a good EU parliament president and she has served as an excellent MEP, Mr Donnelly added.
Ms McGuinness is viewed as one of the frontrunners for the job.
Also speaking on The Week in Politics, Ms McGuinness said she has a reasonable chance of becoming the next president of the European Parliament.
The MEP for Midlands-North-West said she had just completed one election campaign and was now beginning another one to become the parliament's president.
Geography and gender would be factors in determining who gets the job, she added.
Ms McGuinness also said that anger among voters was not a feature of the recent elections.
There has to be cross party buy-in to changes aimed at safeguarding the environment, Ms McGuinness added.
Meanwhile, Waterford Sinn Féin TD David Cullinane has said every TD and councillor in Sinn Féin has to take responsibility for the party's poor performance in the recent elections.
He was responding to how the party fared in the Local and European Elections, in which it lost 78 council seats, and stands to lose two of its MEPs.
Speaking on RTÉ's This Week, he said the party was hurting after the result, and if it was not hurting it would show it does not care.
Mr Cullinane also said he does believe people want change, as there were plenty of people out there who did not vote for Fianna Fáil or Fine Gael.
He said Sinn Féin is a republican and progressive party, and that one of its failures has been not talking up its successes as a party.
Mr Cullinane said he does not see Sinn Féin as a party of protest, and he fully accepts it has to take responsibility for what was a bad day at the office for the party.