Wanting to upgrade old 1.5.3.1 site

[leofrog8]

So - I have a website running 1.5.3.1 on php 5.6 - I understand that php 5.6 is deprecated and my host is warning that I should upgrade to later php.

I understand that upgrading to 1.7.x from 1.5.x is almost impossible so where do I go with this? What versions of PS are compatible with the latest versions of php.  My host currently offers versions 5.6, 7.2, 7.3, 7.4 and 8.

Any suggestions on how I should upgrade my site ......... or is it not worth the effort and "if it ain't broke don't fix it" - trouble is it is breaking - odd errors keep cropping up and I'm thinking I keep patching a sinking ship and it's time to build a new one!

Thanks in advance for any input/thoughts

[leofrog8]

In the end I shelled out for the Migration Pro - it isn't a coverall solution (still lots of work to be done to get the site as functional as it was) but it has taken the tedium out of transferring manually all the site data.