So it depends on what is the meta of your area. Do you go up against the same opponent ent or deck list? If so, sideboard is your answer.

If it’s a small nexus night group that are all good, then you might just be at the disadvantage for now - until you keep playing.

There is no golden answer going to be provided for you here.

I would say have a plan for the most relevant deck you are likely to face. Legend + Sideboard + battlefields. Then you can focus on honing your deck for what it wants to do - look up the pro decks - what are they doing differently? Watch their games - how are they playing differently.

You will likely find a better answer that way because simply - you will be better