A lot of women are adopting "all or nothing" approach, aka "I'd rather live alone than with someone I am not attracted to".
There are various articles where women are interviewed and they report shortage of "attractive males" for relationships. Also others where women claim, "men no longer chase" (my personal opinion is that it's because of metoo men are afraid of pursuing and asking out unless if some woman displays explicit interest)
Meanwhile there are lots of women who have children with the guys they deemed attractive but that guy never commited as a husband or father, some of those are now struggling to pay their bills and raise kids as a single parent. Society has to come forward and help them raise their kids.
Maybe we should get done with traditional marriage and assume every country man or woman is father or mother to every kid existing within the borders of the country and pay for their maintenance and good upbringing as a community as a whole.
Maybe the cost of having kids is too high? And we need to lower it through incentives?
If we choose to not do this - where will the future tax payers come from when the present ones will be on retirement? We borrow from future. Today the taxes you are paying have been used already in past for the welfare of the previous generation. Tomorrow when you'll need welfare, you'll want to have fresh population supporting it.
You can bring in the immigrants but will they have the values which your community needs? Will it require a period of time before they are able to contribute to your society in a positive way?