It's interesting that you mention this, although of course it is up to Admin to decide and no need to think about regret on starting a topic, in my mind, isn't something you should be concerned about as is open to all members and all topics as long as it's kept clean and above board.
Many people I believe come to Portugal as couples or families, as that's mostly the types of friendships I've made and I'm here as a family too but not married and living in sin!
I have become friends with a single male (platonic friends, it goes without saying) who has a property in Portugal and know of a single lady in the UK is considering buying in Portugal but they are not likely to be in Portugal permanently, so you may be looking for a needle in a haystack if at all that person(s) exists.
These people may be looking for partners or new friendships in the same way and amongst the forum it is difficult to find out who is looking for the same, who are with partners or with families or who are single, although I suspect that not many people are in the latter category and you are in a minority.
I suspect you could put a post into Miscellaneous for the time being if Admin doesn't think that this is a suitable topic and I've not seen such a topic on other forums and wonder if it would be unwelcomed by other members given that this is a grey topic and can be misused.
Or, you could get people together who are interested in the same hobbies as yourself and organise a get together, which I find is always the best way to meet new friends if you are interested in the same topics.
A quick search has brought up some websites, although personally I'm not a fan of these types of sites for meeting people, but each to his own:
If I was on my own I would go to car boot sales or other meetings in the area as this would probably involve many Expats attending, get chatting to them and take it from there.
However you approach the issue, I hope you manage to meet up with someone and you're always welcome to visit me, my partner and 7 year old son and the ever increasing in numbers animal house - pm me