I know that some countries are renowned for their hospitality and welcoming atmosphere include. The first country that crossed my mind is New Zealand. The locals, known as Kiwis, are famously friendly and welcoming to visitors. Another safe country could be Ireland. It offers solo travelers a warm and inviting atmosphere not to mention that the Irish are known for their hospitality, lively pub culture, and willingness to strike up a conversation with strangers.
Or perhaps you can also try Canada. Just think about it! Canadians are known for their politeness, friendliness, and multiculturalism. Another destination might be Japan, which is a surprisingly welcoming place for solo travelers. The Japanese are known for their hospitality, respect for visitors, and helpfulness towards foreigners navigating their way through the country.
Another country could be Portugal too because the Portuguese are known for their warmth, friendliness, and genuine interest in visitors.
And finally, as a Hungarian, I must say that Hungary can also be a fantastic destination for solo travelers, especially those interested in history, culture, and vibrant city life. Budapest, the capital city, is known for its stunning architecture, thermal baths, and lively nightlife scene. But what is more important from your perspective is the fact that Hungarians are generally friendly and welcoming to visitors, and English is widely spoken, especially in tourist areas.