Considering dropping care to 1 day a week is it worth it?

I have a 4 year old boy who doesnt really mix with other kids as we dont really get out much. I have him in care 2 days a week but its getting to much on the budget I am a SAHM with a 4 month old as well. I am looking to dropping to 1 day a week He likes going but he also loves to stay home with me. He says sometimes he doesnt want to go but once he gets there its ok. I put him in to care to interact with other kids but I am trying to get more involved with local playgroups and mothers clubs so he can have access to more children to play with. He starts prep next year anyways and am thinking that he only has 6 months more there anyway would dropping a day be a bad things. Any opinions would be great

We started DS off at 1 day a week for the same sorts of reasons, interaction with other kids.

I don't think it's a bad thing, DD started prep/kindy/pre school this year and has never gone to day care and has probably had a lot less interaction with kids than DS and she's fitting in perfectly fine.