Have you isolated your colleagues yourself? Usually, I am always alone and don't participate in any activities of the unit. Going alone is also a person. If this is the case, the solution is to take the initiative to attend the company party, or even create the conditions and opportunities for the party.
Did you cause trouble to others at work? Generally, there are many such situations. There will inevitably be cooperation between colleagues. If the process of cooperation is not very good, it will also bring trouble to others. If there is much trouble, others will not want to be with you. In the face of this situation, the solution is to handle your own work well and give others as little trouble as possible. A typical example is to make a table together. You have finished your part, but there are so many loopholes and mistakes that the person who took over your job has to be an auditor again.
As a newcomer, I guess the reason why people isolate you may be that people don't know you, and you haven't given everyone a chance to fully understand you, so you are not used to it. At this time, what is worth doing is to be kind to others and show goodwill in front of colleagues; At work, when colleagues encounter difficulties, they will take the initiative to help and leave a good impression on everyone; If you need the help of your colleagues, you must be modest and keep a low profile when asking for advice, and don't look like a cow or someone owes you.
Well, I hope it helps you. Good luck with your work.