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https://www.gardeningknowhow.com/ornamental/flowers/plumeria

Your plumeria may be lacking sufficient light if grown indoors. To remedy this, consider pruning the tip above a leaf node to encourage branching and use a balanced fertilizer with higher phosphorus for flowering. Plumerias thrive in full sunlight, so if grown indoors, ensure they receive at least 6-8 hours of direct sunlight daily. If natural light is insufficient, supplement with artificial lighting such as fluorescent or LED grow lights positioned a few inches above the plant. Rotate the plant regularly for even light exposure. Additionally, maintain well-draining soil, regulate watering, and be patient for the plant to develop branches and potentially flower.

Usually brown tips indicate improper watering or low humidity. Since you reduced water and light without dormancy, that may be the problem. It's too late now for dormancy, so I suggest bringing it to more light and increasing watering. Let the soil dry out between waterings.

https://www.gardeningknowhow.com/plant-problems/environmental/what-causes-brown-edges-on-leaves-of-plant.htm

Those buds will likely fall off during the rooting process. Let the ends callous over for a few days before rooting. This article will tell you how:

https://www.gardeningknowhow.com/ornamental/flowers/plumeria/growing-plumeria-cuttings.htm

https://www.gardeningknowhow.com/ornamental/flowers/plumeria/growing-plumeria.htm

This article tells you how to prune:

https://www.gardeningknowhow.com/ornamental/flowers/plumeria/plumeria-pruning-info.htm