People who sit at home feeling sorry for themselves are not going to make friends easily; they will not come knocking on your door. So, you need to get out there and have a positive, happy attitude, otherwise people won't bother to get to know you. Harsh, but I'm afraid, true.
Start by being more friendly with your neighbours, chat and invite them round for coffee. Talk to people in supermarkets etc. I am always talking to the next person in the queue. Visit your local library and see what courses and groups they run. Book clubs are good because they will make you engage in conversation. Go to church and volunteer to do things -they are always desperate for help and you don't have to be especially religious. I'm an atheist but still go to church events like playgroups with my granddaughter and quizzes, which is my 'thing'. I find the Baptist church welcoming. Volunteer for other local organisations such as political groups (I met lots of new, like minded people through campaigning for Brexit) and there's a myriad of charities or physical activity groups to chose from. I went to a swimming therapy group after a knee operation and made friends by just chatting in the communal ( female) changing room. I also made new friends by going on a singles holiday. Perhaps get a dog and smile and talk to every dog walker you meet and admire their pet! Fill your time with activities, even if it's just babysitting for a local family to get some extra cash - there will be loads around who need someone-give your name to the local toddler group.
Maybe if your husband sees you out and about having a nice time, he may want to do more. Never turn down an invitation or refuse to offer help to someone who really needs and appreciates it. Could you perhaps look for a different or extra job which involves more public interaction?
After splitting from my husband some years ago, I had to form a new social life as I was no longer part of the couples circle. Although I would admit my best friends are my two adult daughters, I have several male friends whom I go to quizzes with regularly. One, sadly, has just died and he was a quizzing and a political friend but, all of a sudden within weeks, another guy pops up and wants to be in my team. I do prefer the company of men, I must admit, and have always found it easy to be with men who are 'just mates'. I'm certainly not particularly attractive, so the men aren't engaging with me because of that, but I just find it easy to talk to people about anything even though I was always shy as an only child.