Your name should be ラワンダ in Japanese.
You should not put hiragana and katakana together in your name.
Your name should be シャラダ in Japanese.
Katakana is phonetically used for overseas words and doesn’t have meanings.
However, kanji have meanings.
If you want to have kanji for your name, you should choose kanjis which have positive meanings.
How about 沙羅妥?
沙羅means ‘stewartia pseudocamellia’ which is kind of camellia and 妥indicates means ‘peaceful’ and ‘calm.’