I have been paying into a Help to Buy ISA for about 2 years. I recently realised that the Lifetime ISA is much better for my needs.

I know that I have missed the deadline to transfer all my money over. I have also made a payment of £200 into my Help To Buy in April 2018.

Am I able to open a Lifetime ISA and pay £4000 into it in this financial year?

What is the best thing for me to do? I've read up quite a bit but I don't really understand it all that much.