[tbworld]

My recommendations:

You need to rollback to the backup of your database before you started altering it. Hopefully, you have a backup of your entire system from that point in time.

Tables are interlinked in the database via indexes, IDs and fields. What you have now is a database, with no known state, and most likely is not repairable. Yes, you can alter tables, but you must know the interaction of that table before you alter it.

If your forum data is valuable and you need to put your board back online, then I recommend you hire someone. Unless your database was damaged on a key table, your original problems were probably minor.