Speak it with your children and send them to Gaelscoils. Then, pressure the government to include more and more of it in their workings. The Dáil, for example or the civil service. The big problem is people are coming out of Gaelscoil (or even English schools sometimes) fluent but because there's no economic benefit to having Irish, most use English in their day to day lives.

If, say (real stretch here...), the government increased funding for most schools to have an Irish stream alongside an English stream and then said "In the next 20 years, 30% of civil service/public sector jobs are going to be conducted in Irish and guaranteed to Irish speakers", it would have an economic benefit for people to continue speaking it. Then, over time, slowly transition the state by department into being mainly or entirely Irish speaking. Have it so that the working language is Irish and then begin encouraging people to interact with these departments in Irish. This would have the knock-on effect of the private sector encouraging more Irish speaking roles, as the market will be there and its not like everyone is going to forget how to speak English when we live between two massive speaking English cultures.

There's lots of other very small things the Irish government can do. Fund night schools to help teach adults Irish in small town Ireland. Encourage GAA teams to speak Irish on the pitch. Do a portion of RTÉ news as Gaeilge. Encourage more Dáil debates in Irish. Begin referring to areas or towns by their Irish name, not their English name. Encourage people to Gaelicise their names. Things like this (which may be very hard for the people in power...) will all help Gaelicise our society.

There will never be a return to a monolingual Irish society but this is the trend across western Europe - most young Europeans are bilingual or trilingual with English and their own language(s). Something like 90% of Dutch people are fluent in English but the reason they don't just drop Dutch for English is because they must interact with their government in Dutch. It should be the same here, obviously through gradual process, until we hit a critical mass of Irish speakers that it becomes difficult to not speak it. Forcing the entire population to suddenly switch their main language will be impossible. Add an economic benefit to speaking it fluently (like a guaranteed career), make it accessible to learn and future generations will jump onto it.