FLR (fp) - extension

[Mya101]

Happy new year everybody,I pray this year gives us all our hearts desire.
Please I need advice about renewing my residency but I have a big problem with my Ex and mother of 2 British born,we broke up just over 2 years now,I always pick the kids at school once or twice in a week and we both agree amount of money that I will be giving to support them every month until the first lockdown because I lost my job immediately,so I don’t have permanent job after I working every city I can find job and I missed 2 months of paying and she started blocking me anytime I call to greet the kids and now she don’t want to give me the kids original birth certificate and she don’t want to write letter confirmation all my contributions.it’s my third extension.

Please can someone advice on what to do and if I can do the application myself because everything is so tight now,can’t I afford solicitor and I have a month and half before my leave expiry.

Many thanks