How to make use of POS tags as useful features for a NaiveBayesClassifier for sentiment analysis?

I'm doing sentiment analysis on a twitter dataset (problem link). I have extracted the POS tags from the tweets and created tfidf vectors from the POS tags and used them as a feature (got accuracy of 65%). But I think, we can achieve a lot more with POS tags since they help to distinguish how a word is being used within the scope of a phrase. The model I'm training is MultnomialNB().

The problem I'm trying to solve is to find the sentiments of tweets like positive, negative or neutral.

Structure of datset:

Created pos tags:

I created tfidf vectors from the tweet and gave the inputs to my model:

tfidf_vectorizer1 = TfidfVectorizer(
    max_features=5000, min_df=2, max_df=0.9, ngram_range=(1,2))
train_pos = tfidf_vectorizer1.fit_transform(train_data['pos'])
test_pos = tfidf_vectorizer1.transform(test_data['pos'])

clf = MultinomialNB(alpha=0.1).fit(train_pos, train_labels)
predicted = clf.predict(test_pos)

With the above code I got 65% accuracy. Rather than creating TF-IDF vectors of POS and using them as modal inputs. I'm wondering is there any other way that we can use POS tags to increase the accuracy of the model?