Omni TS next steps: Is Cold Convert the only next step?

Current Omni trinity POB: https://pastebin.com/9cQpaXr3

Hi folks; I've been having fun farming deli mirrors w/Harbinger on strand and melting Lyrica, starting to get some currency and playtime again but not sure how to further grow this character. I know rearranging the tree a little for accuracy and a different timeless jewel w/double damage is there but after that (if it's even worth)...

I worked hard for that bow that cost 58 div at the time haha. Is it true the only thing to do next with a build/character like this is start trying to make/buy a phys bow for cold convert? Do you know of any other build directions this can go as well? Should I work on ditching SoS first?

I'm not against phys>cold, I'm just not PoE wise enough to know my options here and so I'm asking you guys before I start throwing money/resources around. =)

If you have recommendations on how I should/would enjoy making the changes that'd be a big plus, I know I'm very fortunate to have the fractures on this quiver and bow for instance; should I craft on them? Are the bases wrong/too bad to use?